| Acronym | Definition |
|---|
| GEF | Global Environment Facility |
| GEF | Global Economic Forum |
| GEF | Guanine-Nucleotide Exchange Factor (biology) |
| GEF | Global Environmental Forum (est. 1990; Japan) |
| GEF | Gigabit Ethernet over Fiber |
| GEF | Global Environment Fund |
| GEF | General Endowment Fund (various organizations) |
| GEF | Guidance for Employment of the Force (US DoD national military strategy) |
| GEF | German Elite Force (gaming) |
| GEF | Graduate Education Foundation |
| GEF | Generic Extensibility Framework |
| GEF | General Exhaust Fan (various companies) |
| GEF | Global Ejection Fraction |
| GEF | Grazing Enhancement Fund (Canada) |
| GEF | Green Earth Foundation (New York, NY) |
| GEF | Generalized Earliest-First |
| GEF | General Electric Foundation |
| GEF | Ground Equipment Failure |
| GEF | Gain Equalization Filters |
| GEF | Galaxy Evolution Probe (NASA) |
| GEF | Gas Expansion Factor (physics) |